Bit for valve-grinders.



A. ASHWORTH. BH' FOR VALVE GRINDERS.

APPLICATICN FILEDJULY 12. 1915.

1 154 1 59, Patented. Sept. 21, 1915.

' @wumdoz zevemem; upon shewn in my e1" valve preserves e 'eressure upenV we mlve set 51eriz ee velve; the 1!? Features and .1 e 'i iez'th ans.

arm

valve i Tam -f5 l me ewey and shewing evec'z fem 01"- held- "wejeetieni'hereon 'Te. Fig. 2 A and. racks Vera views. s frame mesh-re ism and p0en with the 11 persion of iihe bracket and a threaded 9 and l? reveiublymounted. The 331151- i n 1'5 has eh Gene 18 en eeeh si le thereof Y ingout from the heed 1i and has the siet extending; lengthwise 01" the ee;ire portion.

e'i said to receiveehereein'eugh the suppereing extension en thebrackets 26 Yrljeh fi', *hin ssi sle; A. x ghumb screw weshee 28 ismeeheem the 0f the extension 25 in a threefled hole t0 drew breekeie 26rigidly was: side ef the 23 en each side of he sie'efie.

The ehumbeerew 27 permits the quick adjustment of the make 2-6 anyesired. we: eleng the 310:5 The bracket 26 has the central opening 33therein and the (moss- Wiee greeves 29 in the eppesiee walls of said 89opening 33, suitable lugs exeenfiing eut each side he greeves 23 fieheld the reeks loeseiy and slidebly in line in the greeves 29 dueingtheir reciprocative mogement,

In order toateciprocefiy turn the valve 39, g e spindle is provided inthe bracket 26, being leesely mounted through hale 31 in the Fewerportion of the bracket. A tin-eatie52 epenin'g 32 is provided theoughup- 1111?; 3e fits Within the threaded opening am? has the k nut 35thereon fer holding i' firefly in the adjussed position. The nut 3e hasa central ieng shwise hole pel'mit the spindle 30 to slide Verticallytherein. A pinion 36 is attachedto the spindle 3% Within the opening 33in bracket and n'aeehes loose}? in the racks 22 at each sie, A tensloc011 spnng 37 1s prevzaeci between the upper of ehepinien and 1e Lojler100 end of the nut 3% ice give he fiesirefi pressum on the valve 39. Thenut 13 0f eient length 30 be eurned ii ogening 32 anci thereby glw dewtensien to the spring 3? yes spindle 30 to be menuefiy infuse ega'wertime the pinion escapee eeeve the teeth I thereby permiiting fr e siee.Wise movement of the nmcke; 26 we s efie loose support of the pinion 3Gin racks and the spindle 30 in the bracket 26 permits said spindle toadjust ltself to any movement or inequality of the valve 39 in grindingthe same. This is a flexible movement which is essential to the quickand perfect grinding of the surface of said valve.

The spindle 30 is preferably provided with a flat end 38 having acentering point 40. A spanner bit 41 is preferably provided for theflattened spindle end 38, having a slot 42 in the stem to receivesaid-flattened end 38, said slot having preferably an opening 43 at thecenter of its lower wall for the centering point 40, which arrangementprevents the sidewise movement of the flattened end 38 out of the slot42. The spanner bit 41 is provided on its lower surface with twoprojecting tapered points 44 a spaced distance from the center thereofand on opposite sides of the fiat disk-shaped head The points 44 arepreferably made by screws inserted through threaded openings in thehead. Said head 45 has also the rounded projection 46 central thereof tobear on the center of the valve 39. The valve 39 is provided with spacedholes 47 which are deeper than the length of the spaced pins 44 so thatthey cannot bottom in said holes 47 when the central projection 46 bearson the top of the valve 3,9. 'lhevalve 39 rests on the seat 48 on theengine cylinder 49; valve stem 50 extending dnwn through the hole 51 insaid cylinder. i

In order to grind the valve 39 and valve seat 48, the surfacestherebetween are coated with an alorading compound. The gear 16 may bepower driven but is preferably manually rotated by means of the crank52. When said pinion 17 is so rotated with the machine in position uponthe valve 39, it is apparent that a reciprocating movement will be;given to the racks 22 by the crank shaft formed by the earns 18 and pins19 with rings 20 around said cams, thereby giving a reciprocal rotationto the pinion 36 and the spindle 30 attached therethrough and thespanner bit 41 and valve 39. The loose mounting of the spindle 30permits the spanner 41 to adapt itself to the movement of the valve 39as it turns backward and forward, the pins 44 turning the valve 39 yetnot bottoming in the holes 47 thereby keepthe.

ing constant central pressure on the curved central downward projection46 on the cen ter of the valve 39. This arrangement permits the quickremoval of the spanner bit 41 and the driving mechanism therefor, yet isthoroughly adaptive to any irregular movement of the valve 39, and canbe adjusted to any degree of tension sd as to obtain a perfectly smoothground surface on the valve 39 and valve seat 48.

. 1 claim as new:

1. A valve grinder comprising frame, a spindle rotatively mounted insaid frame, mechanism to rotatively reciprocate said spindle in saidframe, a disk shaped spanner bit having a central opening rem ovablyengaged by said spindle, and a central projection on the end of saidspindle to bear against the center of said spanner bit in said openingwhen reciprocally rotating the same.

2. A valve grinder comprising a frame, a spindle rotatively mounted onsaid frame, mechanism to rotatively reciprocate said spindle, adisk-shaped bit end on said spindle for engaging the valve, projectionson said disk-shaped bit for engaging in spaced openings in the valve toturn said valve, and a curved projection central of said disk to bear onthe center of said valve during the process of grmdmg.

3. A valve grinder comprising a frame, a spindle rotatively mounted onsaid frame, mechanlsm to rotatlvely reciprocate said spindle, aflattened endto said spindle hav- I ing a central projection, a spannerbit having spaced projections thereon to engage in similarly spacedopenings in the valve, said spanner bit having a slotted stem with acentral openingtherein to receive said flat 'spindle end and the centralprojection of, said spindle in said slot and central openand a centralrounded projection on the lower side of said tlpdto bear continuously onthe center of the valve top during the grinding of said valve. Intestimony whereef I have affixed-my signature in the presence-of twowitnesses.

ASA ASHWORTH. I

\Vitnesses: v I

H. A. SANDBERG, HAROLD FonsBERG.

